Added implementation of three classes in BBR,with unit-tests.

webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc

Index: webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc b/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc
index 91e99346bfec2790ef81f031f84751aa78adb9f1..05ab9b10d5787879b3d29154f057d0b767911d0d 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/max_bandwidth_filter.cc
@@ -14,10 +14,24 @@
 namespace webrtc {
 namespace testing {
 namespace bwe {
-MaxBandwidthFilter::MaxBandwidthFilter() {}
+MaxBandwidthFilter::MaxBandwidthFilter()
+    : bandwidth_last_round_(0),
+      round_bandwidth_updated_(0),
+      max_bandwidth_estimate_(0),
+      rounds_without_growth_(0) {}
 
 MaxBandwidthFilter::~MaxBandwidthFilter() {}
 
+void MaxBandwidthFilter::AddBandwidthSample(int64_t sample,

[philipel, 2017/07/06 12:15:15]

what is sample in this case? bps? kbps?

[gnish1, 2017/07/07 13:43:34]

Done.

+                                            int64_t round,

[philipel, 2017/07/06 12:15:15]

what is round? rtt_ms?

[gnish1, 2017/07/07 13:43:34]

Done.

[philipel, 2017/07/10 11:53:35]

Is round the same as rtt? If so, change to rtt_ms.

+                                            size_t filter_size) {

[philipel, 2017/07/06 12:15:15]

bytes? ms?

[gnish1, 2017/07/07 13:43:34]

Done.

[philipel, 2017/07/10 11:53:35]

What does filter_size_round represent?

+  if (round - round_bandwidth_updated_ >= filter_size ||
+      sample >= max_bandwidth_estimate_) {
+    max_bandwidth_estimate_ = sample;
+    round_bandwidth_updated_ = round;
+  }
+}
+
 bool MaxBandwidthFilter::FullBandwidthReached(float growth_target,
                                               int max_rounds_without_growth) {
   // Minimal bandwidth necessary to assume that better bandwidth can still be
@@ -29,9 +43,7 @@ bool MaxBandwidthFilter::FullBandwidthReached(float growth_target,
     return false;
   }
   rounds_without_growth_++;
-  if (rounds_without_growth_ >= max_rounds_without_growth)
-    return true;
-  return false;
+  return rounds_without_growth_ >= max_rounds_without_growth;
 }
 }  // namespace bwe
 }  // namespace testing